Method of charging pulp digesters



E. OLSSON IBTHQD 0F CHARGING PULP DIGESTERS Filed July 14. 1926 Patented Dec. 20, 1927.

UNITED STATES ELIS OLSSON, OF WEST POINT, VIRGINIA.

METHOD OF CHARGING PULP DIGESTERS.

Application filed July 14,

This invention relates to pulp digesters. In order to convert wood chips or other material to be digested into pulp by the chemical process, the chips or other material are introduced into the digester and are treated with" a suitable chemical solution which dissolves the'binding material of the fiber. The chemical solution is usually introduced by gravity from tanks located above the digester or is pumped thereinto from tanks located below the digester.

- This invention has for its salient object to increase thecapacity of a pulp digester.

Another object of the invention v is to utilize ahigh pressure stream of chemical solvent liquor to pack the chips in the digester.

Another object'of the invention is to so charge the digester with chips andsolvent liquor that the chips will .be packed by the stream of liquor.

Further objects of the inventionwill appear from the following specification taken in connection with the drawings, which form a part of this application, and in which Fig. 1 is an elevational view somewhat diagrammatic showing the arrangement of the apparatus (constructed in accordance with the invention and adapted to carry out the method of charging pulp digesters;

Fig. 2 is a top plan view of the structure shown in Fig. 1;

Fig. 3 is an enlarged detail view showing the hopper discharge spout for the chips and the liquor conduitand nozzle; and

Fig. 4 is a view taken at right angles to Fig. 3.

In carrying out-the method, chips are introduced into or deposited in the digester simultaneously with the liquor and the force of the liquor stream is used to pack the chips. In the apparatus illustrated for arrying out the invention, the chips or ot er material are permitted to fall by gravity from a hopper and the stream of liquor is pumped through a conduit and nozzle, means being provided for directing the stream in the desired direction to pack the chips. Further details of the invention will appear from the following description.

In the form of the invention illustrated, a plurality of digesters A, B and C are positioned beneath discharge spouts 10, 1.1 and 12 of a chip bin or hopper 13. Means, [such as a valve 14, may be provided in each of the 1926. Serial No. 122,319.

spouts 10, 11 and 12 for regulating the flow of chips through the spout.

' The solvent liquor is contained in-a tank 20 and is pumped by a pump 21 into a main conduit 22 and from this main conduit into branch conduits .23. Each. branch conduit may have a valve 24 therein for regulatin the flow of liquor through the conduit an each conduit has a flexible conduit or hose 25'secured theretoand a nozzle 26 secured to the other end of each hose. A handle 27 is secured by clamps 28 to each of the hoses 25- and by means of the handle, the hose can be angled so as to direct the stream'against different portions of the chips. The liquor is pumped through the nozzles 26 at relatively high pressure, such, for instance, as sixty pounds or over.

Care is taken in introducing the chips and the stream into the digester to so regulate the rate of charging the chips and stream that the chips will not float or be covered by the liquor but will be packed thereby.

. The force of the stream directed from the nozzle against the chips, packs the chips and utilizes the full capacity of the digester.

By means of the method and apparatus above described, the yield per digester can be materially increased since more chips or other material to be converted into pulp can be digested in the apparatus than by the usual method. In this way, the cost of digesting the pulp can be materially reduced.

Although one particular form of apparatus has been illustrated for carrying out the invention, it will be understood that changes in the construction and in the arrangement of the various parts may be made without departing from the spirit or scope of the invention, as expressed in the following claims.

What I claim is:

1. A method of charging pulp digesters which consists of introducing a stream of solvent liquor into the digester' under high pressure, introducing the material to be digested into the digester simultaneously with the liquor and utilizing the force of the .liquor stream to pack the material to be digested in the digester.

2. A method of char ing which consists of intro ucing a stream of solvent liquor into the digester under pressure, introducing the material to be digested into the digester simultaneously with the pulp digesters liquor and utilizing the force of the liquor solvent liquor into a digester, and directin stream to pack the material in the digester, the stream a ainst the material to be (11- 10 the liquor and material being so introduced gested to uti ize the force of the stream that the material will not be submerged in to pack the material to be digested in the 5 or float on the liquor. di ester.

3. A method of charging pul digesters n witness whereof, I have hereunto set ich consists of introducing pu p material my hand this eighth day of July, 1926.

to be digested and a high pressure stream of ELIS OLSSON. 

